Can ecobee control humidifiers?

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Written By Dinu Sri

Dr. H. T. D. S. Madusanka is an electronic enthusiastic, involved in research and development.

The manufacturer of ecobee smart devices has significantly innovated this item to increase its compatibility with most home devices. Among them is the humidifier.

The ecobee has humidity sensors that can automatically detect the house humidity and adjust it according to the set humidifier points.

Just wire and configure these two devices to get them working. But do not be startled, for I will offer a detailed guide on how to get things done.

However, before we get started, I must highlight that not all the versions of ecobee can control the ecobee. Let us sort that right first before getting our hands dirty.

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Can the ecobee3 lite or 4 control a humidifier?

Since the invention of the ecobee, there have been several updates, with the latest version being ecobee 5. 

As you could guess, every ecobee version can only support limited functionalities. Consequently, not every ecobee will control a humidifier. 

To narrow down, if you need an ecobee to control the humidifier, you should try ecobee3, ecobee 4, and ecobee 5.

Ecobee 3 lite does not have the ACC terminals, which are responsible for controlling the humidifier.

Keeping aside the fact that ecobee 3 lite cannot control humidifiers, dehumidifiers, and ventilators, it is seamlessly compatible with most other devices.

Below is a comparison table between ecobee 3lite and ecobee smart-thermostat (ecobee 5)

FeatureEcobee 5Ecobee 3 lite
DesignWell-crafted smart sensors  and resilient materialsA thinner screen of plastic materials.
Compatibility level95% HVAC systems including humidifiers, dehumidifiers, and ventilators95% HVAC systems excluding humidifiers, dehumidifiers, and ventilators
SoftwareIFTTT, Harmony, Google, Alexa, Homekit and SmartThingsIFTT, Harmony, Google, Alexa, Homekit and SmartThings
Smart technologyAlexa with built-in mic and speakerDoes not include smart sensors

How do I connect my ecobee thermostat to my humidifier?

My first time owning an ecobee that controls the humidifier, my budget escalated due to hiring a professional to perform the connections. When I had a chance to learn how to perform the connections, I didn’t hesitate.

I couldn’t imagine incurring unnecessary expenditures when I have to repair or troubleshoot the ecobee humidifier wiring. Mind you; the wiring is not as technical as I thought.

To have a fully functional ecobee and humidifier, it takes two major steps: wiring the humidifier and ecobee, and finally configuring the two devices.

How to wire a humidifier to an ecobee?

Step 1: power off the HVAC system

The wiring process involves the handling of live wires. Hence, it is recommendable for safety reasons that you have both the humidifier and the ecobee off during the wiring process.

Step 2: locate the wires

After powering off the humidifier, locate the wires that were previously connecting the fan and water valve.

Step 3: do the wiring

The RC, G, Y1, and W1 wires should be wired according to the version of the ecobee. However, if you had already preinstalled the ecobee, you should not tamper with them.

To connect the humidifier with the ecobee, take the brown colored wire and connect to the acc+ terminal.

As simple as that, you have your humidifier and ecobee connected. You are just a step away to have it fully functioning. Let’s also get that out of the way.

Configuring the ecobee

The configuring process makes it possible for the humidifier and ecobee to communicate for a smooth working. Don’t worry! Nothing brainy but more straightforward than you could ever expect. Be set we get started.

Step 1: click on the main menu

This is the very first step when adding any equipment into the ecobee. Thus on your ecobee, remember to power it on and then go to the main menu icon.

Step 2: click on settings

Are you on the main menu? Excellent! Now get to the settings and later into the installation settings.

Step 3: select the equipment

Yes! You are almost done. After clicking on the installation settings, the first thing should be the equipment icon. Click on the equipment icon and then select the humidifier.

Step 4: specify the humidifier type.

Basically, there are two main types of humidifiers the evaporative and steam humidifier. If you are not so sure of the humidifier type, this is the blueprint.

 All the steam humidifiers have a steam canister; if your device has one, it is a steam humidifier. Otherwise, it is an evaporative humidifier.

Select the humidifier type appropriately and click next.

Step 5: edit the humidity set points

Do you need to edit the priory set humidity points? You can easily change them for maximum comfort.

Simply get back to the main menu and go to the ecobee system. After selecting the system icon, press on the humidifier, and press ‘on’ to choose the needed humidity points.

A step further, after pressing on the humidifier, it still gives you the option to activate the frost control.

Finally! Your ecobee and humidifier can have seamless communications with each other. Just place back the ecobee, and enjoy the comfort of your house. It was a simple process, right?

Check the below youtube video for better understanding;


To sum up, the ecobee has not only motion sensors but also humidity sensors, making it possible to control the ecobee.  Specifically, the ecobee3 smart thermostat is compatible with most HVAC devices, hence can work with most humidifiers.

Further, to have the ecobee faultlessly working with the humidifier, you need first to wire them and then configure the humidifier into the ecobee just like any other equipment.


The wiring process of ecobee and humidifier is the simplest. Get the wires that connect to the valve and link it to the ecobee.

On the configuring process, get to the main menu, settings, installation settings, equipment, and then to the humidifier.

Select the humidifier type appropriately. This is the hint; all the steam humidifiers have a steam canister. Lastly, set the humidity points and activate the frost control if you wish.

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